Bug on select fields

I’ve added a custom field of select type, but the values selected aren’t saved.
So i found this line in funciotn meta_box_save():

${$f} = isset( $_POST[$f] ) && is_array( $field_data[$f]['options'] ) && in_array( $_POST[$f], $field_data[$f]['options'] ) ? $_POST[$f] : '';

I don’t think it’s correct, the value of the select it’s matched against texts.
I’ve changed it into:

$values = array();
if (is_array( $field_data[$f]['options'] ))
    $values = array_keys($field_data[$f]['options']);
${$f} = isset( $_POST[$f] ) && in_array( $_POST[$f], $values ) ? $_POST[$f] : '';

Now everything works!

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